Jeremy Corbyn will shake up British politics and represents a reaction against the legacy of former Prime Minister Tony Blair, Labour leader Andrew Little says.
However, the leader of the New Zealand Labour Party is reserving judgment on whether Mr Corbyn can now push on and become prime minister.
The choice of Mr Corbyn, a backbench MP and antiwar campaigner, means the British Labour Party has one of the most left-wing leaders in its history.
Mr Little said the result would "really shake things up in UK politics".
"What he represents is a style of communicating about issues that is shorn of all the PR spin and stuff, and I think that's what people were looking for," Mr Little said.